Listen to The Power ... those are great tips.
But here's a few from me:
Delete Limewire from your system
Download and install Ares (from www.aresgalaxy.com
Don't get viruses
I've used a lot of P2P downloaders (Limewire, Grokster, KaZaa, eDonkey, eMule, Napster, etc.) but Ares is the best by far. A lot files shared and never once have I downloaded any malware. Check it out!